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AUGUSTUS F. NAGLE, OF PROVIDENCE, RHODE ISLADQn Letters .Patent'No. 80,560, dated August 4, 1868.

IMPROVEMENT IN EXPANDING-MANDRELS.

dln rlgehnlr nitriet in in tigen tcttcts jntelrt :on mating gr-nrt nf tige time TO ALL WHOM IT MAY OONCERN: y

Be it known that I, AUGUSTUS F. NAGLE, oi` the city and county of Providence, and State of Rhode Island, have invented a certain new and improved Expanding-Mandrel, particularly valuable as a tool-for use in turning the faces of nuts true with the thread .cut within.

Expanding-mandrels have been made before, and mine diliers from such in the use of a conical arbor, closely fitted into a slotted shell, on the outside of which is cut a screw-thread corresponding with that in the nuts to be faced or turned straight to snit drilled holes. With' the assistance of the'accompanying drawings, I will give a true and exact description of my invention.

Figurevl -represents a full view of one oi` 1ny mandrels, with a nut thereon.

Letter A represents a conical or tapering arbor or shaft, traversing and closely fitting the interior ofthe shell B.

B represents a slotted shell or hollow arbor, on one end oi which is (or may be) out a screw-thread., as shown.

C C represent the slots referred to.

B B represent that portion of the shell between the slots.

D represents a. nut turned on the thread.

Figure 2 represents a vertical section of the mandrel. Parts therein'are lettered and marked as in iig. 1t

The operation of the mandrel is asl follows: The tapering shaft A` being loosened, a nut is easily turned upon the thread ofthe slotted shelllB B and B. In order to hold-the'nut firmly in position while being faced, the tapering shaft A is forced'in the direction indicated bythe arrow, expanding the slotted portion of shell B or B B, thus securely holding the nut in position.. l

I claim as my own invention, and desire to secure by Letters Patent-- y A n expanding-mandrel, as herein described, consisting of the slotted shell B, having spring-jaws.` B B, and taperingA arbor A, all constructed, arranged,'and operating in manner set forth.

' 4 A. F. NAGLE.'

Witnesses:

EDWIN L. PEcK, FRANK I. Pennen. 

